1
User Manual
ALFA(NET) 33 (0-400
O
C)
Min./Max. Alarm thermostat.
VDH doc. 072382
Version: v1.0
Date: 16-10-2007
Software: ALFA(NET) 13/33 0-400
C
File: Do072382.WPD
Range: 0/+400
C, readout per 1
C
* Function.
The
ALFA(NET) 33
is a digital alarm thermostat for panel mounting. The thermostat watches the
minimum and maximum temperature. The
ALFA(NET) 33
has one relay for both alarms.
The
ALFA
NET
33
has a RS 485 network connection so it can be read out and adjusted on the Alfanet.
* Installation.
On the topside of the
ALFA(NET) 33
you can see how the sensor, power supply and relay has to be
connected.
After connecting the
ALFA(NET) 33
to the power supply, a self test function is started. As this test is
finished, the measured temperature appears in the display.
The relay is normally activated. As an alarm appears it will be deactivated and the led 'on' will light-up
in the display.
* Control.
The
ALFA(NET) 33
alarm thermostat can be controlled by three pushbuttons on the front;
SET
- view / change set points and reset of alarm.
UP
- increase a value.
DOWN
- decrease a value.
* Viewing setpoints.
Viewing set point of maximum alarm:
By pushing the
SET
key first and then the
UP
key simultaneously the maximum alarm set point
appears in the display. The led 'set high' starts blinking.
Viewing set point of minimum alarm:
By pushing the
SET
key first and then the
DOWN
key simultaneously the maximum alarm set point
appears in the display. The led 'set low' starts blinking.
A few seconds after releasing the keys the set point disappears and the measured temperature is
shown in the display again.
* Changing set points.
Push the
SET
key together with the
UP
or
DOWN
key and the maximum alarm set point or minimum
alarm setpoint appears in the display. Release both keys.
Now push the
SET
key again and with the
UP
or
DOWN
keys the set point can be changed. A few
seconds after releasing the keys the measured temperature shows again in the display.
